Ratchet-and-pawl device



(No Model.)

J. s. OBRIEN. RATUHET AND PAWL DEVICE.

No. 252,962. I Patented Jan. 31,1882.

NITED STATES PATENT Farce.

JOSEPH s. OBRIEN, OF PRINGFIELD, MASSACHUSETTS.

RATCH ET-AND-PAWL DEVICE.

SPECIFICATION forming part of Letters Patent No. 252,962, dated January31, 1882.

Application filed December 8, 1881.

To all whom it may concern Be it known that I, JOSEPH S. OBRIEN, acitizen of the United States, residing at Springfield, in the county ofHampden and State of Massachusetts, have invented new'and usefulImprovements in Ratchet-and-Pawl Devices, of which the following is aspecification.

The invention relates to improved ratchetand-pawl devices formowing-machines and other uses, the object being to provide such deviceswhich are strong and positive in their operation, but above allperfectly noiseless, so that when the motion of said niachinesisreversed the usual ratchet noise made by them will be obviated.

In the drawings forming part of this specification, Figure 1 illustratesone endof a mowing-machine drum having applied thereto ratchet-and-pawldevices constructed according to my invention. Fig. 2 is a view of thepawl disk or plate. Fig. 3 is a view of one of the pawls, and Fig. 4 isasegment of the ratchet-ring.

In the drawings, A is the drum. B is the ratchet-ring. c c are thepawls. d is a shaft. 0 0 are pins placed in acollar, i, on said shaft,or directly therein, and standing at right angles to its axial line; andh is a grooved pawldisk.

The shaft (1 is' fixed in the drum A and adapted to turn with it, andhas fixed therein, in a collar, i, thereon, two pawl-pins,oo,standing atright angles to said shaft and upon opposite sides thereof.

The pawl-disk h is bored to slip over co'lar i on shaft (1, and has twogrooves, x 00, formed in one side thereof to receive the pawl-bars c c,the latter being notched to receive pins 0 0. The ratchet-ring B in thisapplication of the ratchet-and-pawl devices has a gear formed on itsperiphery, to provide means for direct connection between drum A and thecutter-bar shaft of a lawn-mowing machine, and said (No model.)

ratchet-ring is by any well-known construction of such wheels made witharms ora solid be driven in opposite directions, and each will carry oneof the pawls 0 toward the periphery of disk h, causing the outer beveledends of said pawls to engage with the teeth of the ratchet-ring B andrevolve the latter by the rotation of said drum; but when the motion ofthe latter is reversed the said pawls are drawn back away from ring Band clear from it, and disk It and said pawls revolve noise lesslywithin said ring.

It will be seen by the above description of said ratchet-and-pawldevices that the movement of the pawls both toward and from theratchet-ring is positive, no springs being relied upon, and that theywill surely act regardless of the position of the parts.

The within-described application of said ratchet-and-pawl devices isonly one out of many to which it may with advantage be adapted.

WVhat I claim as my invention is- The within-describedimprovedratchet-andpawl device, consisting of the shaft 01, having the pns o otherein, the pawls c c, notched to receive said pins, the disk 71,grooved to receive said pawls in the face thereof, and the ratchet-ringB, all combined and operating substantially as set forth.

- JOSEPH S. OBRIEN.

Witnesses H. A. UHAPlN, H. E. WILKINS.

